Numerous rounds of erosion. Can be by attrition-rocks smacking together and breaking each other up, Abrasion-Rocks scraping against each other like sandpaper, corrosion-natural acids dissolving the rock. There's also one where plants grow and force rocks apart etc

because of Erosion
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a combination of the physical breaking down of rock into smaller pieces and chemical weathering of minerals to form other minerals more stable for the conditions.

A mineral that formed at 750C and in absence of water will generally not remain chemically stable at room temperature and in the presence of water. A few, such as quartz, do remain stable, but most, particularly feldspars and the ferromagnesian minerals, are not the stable structures at lower temperatures when in the presence of
is this ok?
Yes! Thank you very much!